Hello Guest! Kumusta!

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Anthony: Focusing rail helps to position the camera on the exact mag rate you want. Once you've got that, adjust the focus points for each shots by the lens barrel (on MF), not through the focusing rails (secret yan, atin-atin lang ha ). If you saw the subject moves or your gear moves during the process, restart all over as that will likely fail when you do the image stack.

Just for your info, you may search for ComineZM (freeware) or Helicon Focus and Im, of course, using the freeware.